hi, just wondered if anyone has fitted an aftermarket stereo to the mk2.5 focus? I have a 58 plate zetec 2.0 tdci with the upgraded sony 6 disc player, it doesnt have a usb port and on investigation I need to upgrade the bluetooth module to the one with usb support, at a cost of £170, after looking at eBay I saw this ebay auction just wondered if anyone had done such before, and if these things are as easy a fit as the listing on ebay suggests, the benefits of touchscreen and sat nav etc, may be worth paying the extra for a new head unit, or should I stick with the Sony?? advice gra